2021 ICD-10-CM Diagnosis Code H49.10

Fourth [trochlear] nerve palsy, unspecified eye

    2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • H49.10 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2021 edition of ICD-10-CM H49.10 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of H49.10 - other international versions of ICD-10 H49.10 may differ.
The following code(s) above H49.10 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to H49.10:
  • H00-H59
    2021 ICD-10-CM Range H00-H59

    Diseases of the eye and adnexa

    Note
    • Use an external cause code following the code for the eye condition, if applicable, to identify the cause of the eye condition
    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
    • diabetes mellitus related eye conditions (E09.3-, E10.3-, E11.3-, E13.3-)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury (trauma) of eye and orbit (S05.-)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    • syphilis related eye disorders (A50.01, A50.3-, A51.43, A52.71)
    Diseases of the eye and adnexa
  • H49-H52
    2021 ICD-10-CM Range H49-H52

    Disorders of ocular muscles, binocular movement, accommodation and refraction

    Type 2 Excludes
    • nystagmus and other irregular eye movements (H55)
    Disorders of ocular muscles, binocular movement, accommodation and refraction
  • H49
    ICD-10-CM Diagnosis Code H49

    Paralytic strabismus

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 2 Excludes
    • internal ophthalmoplegia (H52.51-)
    • internuclear ophthalmoplegia (H51.2-)
    • progressive supranuclear ophthalmoplegia (G23.1)
    Paralytic strabismus
Approximate Synonyms
  • Fourth cranial nerve palsy
  • Fourth nerve palsy
ICD-10-CM H49.10 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 123 Neurological eye disorders

Convert H49.10 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
ICD-10-CM Codes Adjacent To H49.10
H47.642 …… left side of brain
H47.649 …… unspecified side of brain
H47.9 Unspecified disorder of visual pathways
H49 Paralytic strabismus
H49.0 Third [oculomotor] nerve palsy
H49.00 …… unspecified eye
H49.01 …… right eye
H49.02 …… left eye
H49.03 …… bilateral
H49.1 Fourth [trochlear] nerve palsy
H49.10 …… unspecified eye
H49.11 …… right eye
H49.12 …… left eye
H49.13 …… bilateral
H49.2 Sixth [abducent] nerve palsy
H49.20 …… unspecified eye
H49.21 …… right eye
H49.22 …… left eye
H49.23 …… bilateral
H49.3 Total (external) ophthalmoplegia
H49.30 …… unspecified eye

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.